To make this upgrade as smooth as possible, this guide is broken down into several clear parts: an essential introduction, pre-upgrade checks, a step-by-step walkthrough, important troubleshooting information, and some frequently asked questions.
Download the update file (named EBOOT.PBP ).
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: Update to an intermediate firmware like 3.52 M33-4 or 3.71 M33 if a direct update fails.
Fully compatible with permanent custom firmware. Since you are already running 3.52 M33, you own one of these hackable models. To make this upgrade as smooth as possible,
Move this 6.60 EBOOT.PBP file into the PSP/GAME/UPDATE/ directory.
Old M33 firmwares sometimes had "version.txt" files that tricked the PSP into thinking it was on version 9.90, which blocks official updates. : Update to an intermediate firmware like 3
Place the 5.00 M33 installer folder (usually named UPDATE ) into PSP/GAME/ .